Abstract
Cbp1p is a nuclear encoded protein required for the stabilization of mitochondrial COB mRNA, which codes for apocytochrome b in the yeast Saccharomyces cerevisiae. The COB gene is cotranscribed with the upstream tRNA(Glu) gene. Release of tRNA(Glu) from the initial transcript generates a precursor mRNA with a 5'-end at position -1098. The 5'-end of mature COB message is generated by cleavage of the pre-mRNA at nucleotide -955 or -954. Previous work indicated that Cbp1p acts through cis-elements near these cleavage sites. Here we have tested whether Cbp1p stabilizes COB mRNA solely by stimulating the processing of COB precursor RNA at nucleotide -955/-954. Yeast strain TG955 was constructed such that the -955 COB mRNA 5'-processing site coincides with the upstream tRNA 3'-endonuclease site at position - 1098, allowing the 5'-end of COB mRNA to be formed by the tRNA 3'-processing enzyme. Respiratory growth and stability of COB mRNA in TG955 are Cbp1p- dependent. Therefore, we conclude that Cbp1p is important for the stabilization of COB mRNA after 5'-processing.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 16574-16578 |
| Number of pages | 5 |
| Journal | Journal of Biological Chemistry |
| Volume | 269 |
| Issue number | 24 |
| State | Published - 1994 |
ASJC Scopus subject areas
- Biochemistry
- Molecular Biology
- Cell Biology